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The proportion of PN in the derivation cohort was 12.6%, and we assumed 25% as the point prevalence of individual risk factors, as in the Asia Pacific Colorectal Screening (APCS) study by Yeoh and colleagues. Based on these assumptions, a minimum of 3,100 subjects were needed to attain a power of >80% so that a risk factor with an odds ratio of two could be detected at a significance level of p < 0.05. Therefore, the other 3,789 subjects formed our validation cohort.

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